Try logout app.

First, with main deco connected to the internet source only and ensure that the firmware upgrading has completed.

Then please connect other Decos to the main router by wired cable to update the firmware and give it a go. 

May it help. 

I found the firmware update a bit of a mess, but got there eventually.

I have 9 decos.  Five updated OK at the first time of asking.  The Deco app (running on my Samsung Galaxy S9) then got locked onto a page saying "Some of your Decos are not running on the latest firmware".  Every time I tried to install the new firmware I would get an "Update failed" message. Annoyingly I couldn't get back to the index of decos to check which ones were running the new firmware (1.2.5) and which hadn't updated and were still on 1.2.4.

The solution was to reboot my phone, open the Deco app, go straight to the list of the Decos and try to note down which ones were on which firmware version, before the "Some of your Decos are not running on the latest firmware" message came up and hexed everything.  I then gathered up the four miscreants and hardwired each of them in turn to the Main Deco.  I then had to reboot the Main Deco in order to be able to redownload the firmware update - happily I only had to reboot once, but still had to redownload the new firmware for each of the miscreant decos in order to be able to update it.  Not the end of the world, but a couple of hours I could have done something better with.

This is the second firmware update in a row that has been a pain, which is a pity as generally the system works well for me.

John

Hello, sorry for the inconvenience caused here; meanwhile it is glad to hear that you sorted it out. 

FYI, there is another easier way to update the firmware-- bring them into the same room and do the firmware upgrading.

Besides, if some of decos failed to update, to find out what they are, you can check the app or contact us to do so.

Good day.